Between 1980 and 2005, 7,454 American companies went public. Of these,

• 2,019 have gone out of business
• 5,048 have not reached $1 billion annual revenue threshold
• 387 have reached $1 billion annual revenue threshold and as of 2005, accounted for 56% of employment and 64% of market value

Source: David G. Thomson, Blueprint to a Billion.